MH1118

Heptode frequency changer for superheterodyne receiver service. Its multi-grid structure combines oscillator and incoming signals for intermediate-frequency conversion, providing conventional mixer operation in series-heater receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: M7A
Base pins: -
Nominal heater: 10 V / 180 mA

Description

Pentagrid-converter heptode for multiplicative mixing and oscillator service in superheterodyne receivers.

Socket description

British/European 7-pin

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: M7A
Base pins: -
Nominal heater voltage: 10 V
Nominal heater current: 180 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 360000 Ω
Transconductance: 0.000475 S
Max plate voltage: 250 V
Max screen voltage: 100 V

Published ratings and characteristics promoted from the approved source.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

HeaterVoltageNominal
10 V
Nominal
HeaterCurrentNominal
180 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Screen Voltage
100 V

Characteristic

Transconductance
475 µS
Typical
Plate Resistance
360000 ohm
Typical